Home > Publications database > Comparative interpretation of absorption spectra of technetium(IV) and rhenium(IV) hexahalides |
Book/Report | FZJ-2017-02916 |
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1965
Kernforschungsanlage Jülich, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/14166
Report No.: Juel-0243-RC
Abstract: Absorption spectra of aqueous solutions of TcX$_{6}^{--}$ and $ReX_{6}^{--}$ (X=F, Cl, Br, I) are measured between 8 000 and $\thicksim$ 50 000 cm$^{-1}$ and theoretically discussed. The electron transfer spectra indicate the optical electronegativity $x_{opt}$=2.25 for Tc (IV) and 2.05 for the less oxidizing Re (IV). The spectrochemical parameter L1 is determined to 28 400 cm$^{-1}$ in $TcF_{6}^{-}$ and 32 800 cm$^{-1}$ in $ReF_{6}^{--}$. The nephelauxetic effect is evaluated from the spin-forbidden intra-sub-shell transitions in all eight species, and from the two spin-allowed bands of $TcF_{6}^{--}$. The vibrational structure of the narrow absorption bands and the possible weak distortion from octahedral symmetry of Tc (IV) hexahalides are discussed.
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